Maybe some mappers already had the problem working on a nice scripted sequence and at one point realizing there is no possibility to put a monster in a idle-animation by a trigger. After the levelstart the monster plays the Idle Animation of the scripted_sequence only until it is triggered. The only way to fake a triggerable idle-animation is to enter the name of the animation in the field Action Animation and retrigger the scripted_sequence as long as it is needed. Short: creating a loop with scripted_sequence. But the next unsightly effect is after each scripted_sequence the monster going back in is default-Activity (mostly ACT_IDLE). So if you have a monster lying on the floor it "stands up" after the animation is done before it restart the animation. This happens because the monsters activity is reseted after the last frame of the animation. Opposing Force and Sven Coop already create soluation for fluent transitions between scripted_sequences with a new Entity-Flag: No Reset Entity. I don't know how they do it but here is my way (new entries are bold)